JPH10325842A - Rotational speed sensor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotational speed sensor and its manufacturing method capable of simplifying the structure of terminal members, enhancing the assemblability of the terminal members, and capable of reducing the molding cost. SOLUTION: A uniting part 2d is molded into a body on the upper end side of a bobbin member 2, and a temporarily fixing part 10 for performing temporary fixing connecting the end part of a coil conductor 6 is provided projecting on a fitting surface for the bobbin member 2. And a terminal member 8 is formed into an L shape and composed of a leg section 8a and a terminal section 8b. The leg section 8a of the terminal member 8 is fixed to the uniting part 2d by press fitting. After the end part of the coil conductor 6 is connected to the temporarily fixing part 10 and temporary fixing it performed, the end part of the coil conductor 6 is soldered to the leg section 8a. After that, a case 9 for encasing the bobbin member 2 and the terminal member 8 is full- molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational speed sensor and a method for manufacturing the same, and more particularly, to a technology for simplifying the structure of a pair of terminals and enabling easy manufacture.

[0002]

2. Description of the Related Art Generally, a rotational speed sensor called an electromagnetic pickup has an induction coil wound around a part of an outer peripheral portion of a bobbin member, a permanent magnet and a magnetic body are housed inside the bobbin member, and a detection target is detected. By detecting the induced electromotive force induced in the induction coil in cooperation with the tooth profile of the member, the rotational speed is detected via the tooth profile of the detected member.
For example, a rotational speed detection device described in Japanese Utility Model Publication No. Hei 8-2614 discloses a bobbin member, a permanent magnet spacer and a magnetic pole bar housed in the bobbin member, an induction coil wound around a part of the outer peripheral portion of the bobbin member, A pair of metal terminal members,
It has a connector cover that surrounds the outside of the contact portion of the terminal member, a case that is fully molded so as to enclose a bobbin member, and the like.

Each terminal member has a leg portion oriented in the axial direction of the bobbin member, a connection end portion obtained by bending a lower end portion of the leg portion in a radial direction to wind an end portion of the induction coil, and an upper end of the leg portion. A contact end extending horizontally from the portion. The bobbin member and the connector cover are integrally formed.

[0004]

In the rotational speed detecting device described in the above publication, the terminal member is not L-shaped, and the connection end protrudes from the leg, so that the terminal is easily assembled by press fitting or the like. Therefore, it is necessary to integrally form the bobbin member and the connector cover in an integrated structure, and at that time, a pair of terminal members must be incorporated by insert molding. Therefore, the structure of the terminal member is complicated, the assemblability of the terminal member is low, the mold for forming the bobbin member is complicated, and the manufacturing cost is high. An object of the present invention is to simplify the structure of the terminal member, improve the assemblability of the terminal member,
An object of the present invention is to provide a rotational speed sensor capable of simplifying a bobbin member forming die and a method of manufacturing the same.

[0005]

According to a first aspect of the present invention, there is provided a rotational speed sensor comprising: a synthetic resin bobbin member in which a coil conductor is wound around a part of an outer peripheral portion and at least a magnet is accommodated inside; and a pair of terminal members. And a rotation speed sensor including a synthetic resin case enclosing the bobbin member and the terminal member, wherein each terminal member is oriented in the axial direction of the bobbin member and is fixed to the bobbin member. And a terminal portion extending at a right angle from one end of the bobbin and connected to an external harness.
A connecting portion that can press-fit each leg of the pair of terminal members from a direction parallel to the axial direction thereof, and temporarily fix the end of the coil conductor to a state where it can be soldered to each press-fitted leg. And a temporary fixing portion.

Each terminal member is formed in an L-shape including a leg portion and a terminal portion, and the leg portion can be press-fitted into a connecting portion of the bobbin member so that the terminal member can be connected to the bobbin member. It can be easily assembled by press-fitting into the part. After the press-fitting, the end of the coil conductor is temporarily fixed to the temporary fixing portion of the bobbin member, and then the end of the coil conductor can be soldered to the leg of the terminal member.

According to a second aspect of the present invention, there is provided a rotational speed sensor comprising: a synthetic resin bobbin member having a coil conductor wound around a part of an outer peripheral portion thereof and containing at least a magnet therein; a pair of metal terminal members; In a rotation speed sensor provided with a synthetic resin case enclosing a member and a terminal member, each terminal member is oriented in the axial direction of the bobbin member and is fixed to the bobbin member, and one end of the leg portion The bobbin member has a mounting surface parallel to the axial direction of the bobbin member, and each leg is heat-sealed to the mounting surface. And a temporary fixing portion for temporarily fixing an end of the coil conductor to each leg so as to be solderable.

Each terminal member is formed in an L-shape including a leg portion and a terminal portion, and the leg portion can be fixed to the mounting surface of the bobbin member by heat fusion. Can be easily fixed to the surface.
After the heat fusion, the end of the coil conductor is temporarily fixed to the temporary fixing portion of the bobbin member, and then the end of the coil conductor can be soldered to the leg of the terminal member.

According to a third aspect of the present invention, there is provided a rotational speed sensor.
In the invention, the temporary fixing portion comprises a pair of pin portions projecting from both sides of the leg portion. Therefore, when the ends of the coil conductor are wound around the pair of pins after the legs of the terminal member are press-fitted, the ends of the coil conductor cross the legs,
It can be easily soldered. Other operations are the same as those of the first aspect.

According to a fourth aspect of the present invention, there is provided a rotational speed sensor according to the third aspect.
In the invention, a notch is formed at a base portion of each of the pin portions, the cutout portion restricting movement of the coil wire in the axial direction of the pin portion. The end of the coil wire is wound around the base of the pair of pins, and the movement can be regulated by the cutout. Other effects are the same as those of the third aspect.

According to a fifth aspect of the present invention, there is provided a rotational speed sensor according to the third aspect.
In the invention, the pair of pin portions are formed such that the distance between the pin portions becomes smaller as they approach the base portion side. Therefore, the end of the coil conductor can be wound around the base of the pair of pins, and that state can be maintained. Other effects are the same as those of the third aspect.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a rotational speed sensor, wherein a synthetic resin bobbin member for winding a coil conductor around a part of an outer peripheral portion and a pair of metal terminal members are manufactured in advance. A method of fabricating a rotational speed sensor, wherein a first step of connecting legs of each terminal member to the connecting section of the bobbin member by press-fitting, and a coil wound around a part of an outer peripheral portion of the bobbin member A second step of temporarily tying the end of the conductor to the temporary fixing portion of the bobbin member, a third step of soldering the temporarily fixed coil conductor to a leg of the terminal member, and one pair with the bobbin member. And a fourth step of full-molding the case so as to include the terminal member.

As described above, the leg of the terminal member is pressed into the connecting portion of the bobbin member, and the end of the coil wire wound around a part of the outer peripheral portion of the bobbin member is entangled with the temporary fixing portion of the bobbin member. Temporarily fixed, the temporarily fixed coil conductor is soldered to the leg of the terminal member, and the case is manufactured by full molding so as to enclose the bobbin member and the pair of terminal members.

According to a seventh aspect of the present invention, there is provided a method for manufacturing a rotational speed sensor, wherein a synthetic resin bobbin member for winding a coil conductor around a part of an outer peripheral portion and a pair of metal terminal members are manufactured in advance. A method of fabricating a rotational speed sensor, wherein a first step of connecting the legs of each terminal member to the mounting surface of the side part of the bobbin member by heat fusion, and a part of an outer peripheral part of the bobbin member A second step of temporarily tying the end of the coil wire wound around the bobbin member to the temporary fixing portion, and a third step of soldering the temporarily fixed coil wire to the leg of the terminal member; And a fourth step of full-molding the case so as to include the bobbin member and the pair of terminal members.

As described above, the leg portion of the terminal member is fixed to the mounting surface of the bobbin member by heat welding, and the end of the coil wire wound around a part of the outer peripheral portion of the bobbin member is temporarily fixed to the bobbin member. Then, the case is fully molded and soldered to the leg of the terminal member, and the case is fully molded so as to include the bobbin member and the pair of terminal members.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example in which the present invention is applied to a rotation speed sensor called an electromagnetic pick-up that detects the rotation speed of a turbine shaft of an automatic transmission for an automobile. First, the structure of the rotation speed sensor 1 will be described. As shown in FIGS. 1 to 5, the rotation speed sensor 1 includes a bobbin member 2 made of a synthetic resin, a yoke 3 made of a magnetic material housed therein,
A permanent magnet 4, a pole 5 made of a magnetic material, and a coil wire 6 wound around the lower half of the bobbin member 2 in multiple layers.
A glass cloth cloth 7 for coil protection wound around the outside of the coil conductor 6, a pair of metal terminal members 8 to which a pair of ends of the coil conductor 6 are connected, respectively;
There is a case 9 made of a synthetic resin and the like that encloses the bobbin member 2 and the terminal member 8.

The bobbin member 2 is substantially cylindrical, and a yoke 3 and a permanent magnet 4 are accommodated in an upper half cylindrical portion 2a of the bobbin member 2. A pole 5 is inserted through a lower half cylindrical portion 2b of the bobbin member 2, A coil conductor 6 is wound around the outside of the half cylindrical portion 2b.
On one side of the upper half cylinder portion 2a, a mounting surface 2c is formed which is a plane parallel to the axis of the bobbin member 2.
A connecting portion 2d capable of fixing the pair of terminal members 8 is formed above the upper half cylindrical portion 2a.
A pair of ribs 2e integral with d are integrally formed. However, a yoke 3 is provided at the upper end of the upper half cylindrical portion 2a of the bobbin member 2.
An opening for assembling the permanent magnet 4 is formed.

Each of the terminal members 8 is press-fitted into the connecting portion 2d from above and extends to the middle of the mounting surface 2c.
And a terminal portion 8b that extends horizontally at a right angle from the upper end of the leg portion 8a.
And a guide slope 8c is formed at the lower end of the leg 8a. Mounting surface 2c of bobbin member 2
Is integrally formed with a temporary fixing portion 10 for winding and fixing the end 6a of the coil conductor 6 so as to be able to be soldered to each leg 8a press-fitted into the connecting portion 2d. 8
5A, a pair of pin portions 11 projecting at right angles to the mounting surface 2c so as to be located on both sides of the pair of pin portions 11. As shown in FIG. Is formed with a notch 11a for restricting the movement of the end 6a of the coil conductor 6.

Near the lower end of the mounting surface 2c, a coil wire 6
A pair of positioning pins 12 for temporarily positioning the end portions 6a of the pair are also integrally formed. One end 6a of the coil wire 6 wound around the bobbin member 2 is
2 and soldered to one leg 8 a with solder 14 while being entangled with one temporary fixing portion 10, and the other end 6 a of the coil conductor 6 passes through a positioning pin 12. The other leg 8 while being entangled with the other
a is soldered with the solder 14. Each leg 8a is provided with a heat radiation prevention hole 13 located above the temporary fixing portion 10.

The case 9 is formed by full molding so as to cover the outer peripheral side and the upper end side of the bobbin member 2 and a connector case section 9a outside the pair of terminal sections 8b.
Are also integrally formed. At a height position substantially corresponding to the upper end of the bobbin member 2, a mounting flange portion 9b is formed integrally with the case 9, and a fixing metal 15 is brought into contact with the mounting flange portion 9b from above, and a bolt 16
To be attached to the case of the automatic transmission. In addition, about one-half of the terminal portion 8b of the pair of terminal members 8 is exposed at a central portion inside the connector case portion 9a, and is electrically connected to a terminal portion of a mating connector (not shown). Is done.

A method of manufacturing the rotation speed sensor 1 will be described. In the parts manufacturing stage, the bobbin member 2, the yoke 3, the permanent magnet 4, the pole 5, and a pair of terminal members 8 are manufactured in advance, and the yoke 3, the permanent magnet 4, and the pole 5 are assembled to the bobbin member 2. Next, in a first step, in a state where the bobbin member 2 to which the above-mentioned parts are attached is set in a press-fitting device in a posture shown in the drawing, as shown in FIG. 2
Of the bobbin member 2 at the same time in parallel with the axis of the bobbin member 2 from above. After the press-fitting, the pair of leg portions 8a comes into contact with the mounting surface 2c (see FIG. 4).

Next, in a second step, the coil conductor 6 is wound around the lower half cylindrical portion 2b, and the pair of ends 6a of the coil conductor 6 is guided by the pair of positioning pins 12 while being guided.
A pair of the pin portions 11 as the corresponding temporary fixing portions 10 are entangled with the base portions and temporarily fixed to the leg portions 8a so as to be solderable.
In this temporarily fixed state, the end 6a of the coil conductor 6 is cut out 1
Since it is wrapped around 1a and is regulated so as not to move in the axial direction of the pin portion 11, the pin portion 11 is almost in contact with the outer surface of the leg portion 8a.

Next, in a third step, as shown in FIG. 5, the end 6a of the coil conductor 6 is soldered to the corresponding leg 8a by soldering. At the time of this soldering, the heat radiation preventing action of the heat radiation prevention hole 13 increases the temperature rising speed of the leg 8a, and the enamel or the like of the coil conductor 6 is burned off so that the coil conductor 6 can conduct electricity to the leg 8a. Connected to. Next, in a fourth step, the bobbin member 2 with various components such as the terminal member 8 is set in a mold of a molding machine, and the case 9 is integrally molded with the bobbin member 2 by full molding.

The operation and effects of the above-described rotational speed sensor 1 and the method of manufacturing the same will be described. In the use state of the rotational speed sensor 1, every time the teeth of the tooth member rotating integrally with the turbine shaft of the automatic transmission pass near the tip of the pole 5, the magnetic field changes and pulse-like induction is applied to the coil conductor 6. An electromotive force is generated, and the induced electromotive force is output to an external electric circuit via the pair of terminal members 8, and the rotation speed is detected.

The terminal member 8 is connected to a leg 8a and a terminal 8b.
The connecting member 2d is formed on the bobbin member 2, and the leg 8a of the terminal member 8 is press-fitted into the connecting portion 2d and can be fixed. Therefore, the structure of the terminal member 8 is simplified. The assembly of the terminal member 8 is simplified. When the bobbin member 2 is formed, the terminal member 8 is formed.
Since it is not necessary to perform insert molding, the structure of a mold for bobbin member molding is simplified, and the molding cost is reduced. Since the temporary fixing portion 10 for temporarily fixing the end portion 6a of the coil conductor 6 is provided on the bobbin member 2, it is possible to temporarily fix the end portion of the coil conductor 6 to the temporary fixing portion 10 and then solder the leg portion 8a. it can.

The end portion 6a of the coil conductor 6 can be temporarily fixed to a solderable state by the temporary fixing portion 10 having a simple structure, and the notch portion 11a is formed in the pin portion 11 as the temporary fixing portion 10. Since it is formed, it is possible to restrict the end 6a of the coil conductor 6 from moving from the temporary fixing position. Further, since the positioning pin 12 for guiding the end of the coil conductor 6 is provided, the coil conductor 6 can be connected to the bobbin member 2.
Unwinding can be prevented. Since the heat radiation preventing holes 13 are formed in the leg portions 8a of the terminal member 8, it is difficult to dissipate heat at the time of soldering, and the coating of the coil conductor 6 can be reliably burned off and soldered. Efficiency can be improved.

A modification of the above embodiment will be described. 1) In the third step, the end 6a of the coil conductor 6 is
a after soldering to the notch 11a of the pin 11
The pin portion 11 may be bent and broken at the position, and removed. 2) As shown in FIG. 6, the notch portion 11a of the pin portion 11 is omitted, and each pair of pin portions 11 is formed such that the distance between the pin portions becomes smaller as they approach the base end side. With such a configuration, the end of the coil conductor 6 is connected to the pair of pin portions 1.
1 can be wound around the base end portion so as to be substantially in contact with the leg portion 8a, and soldering can be reliably performed. still,
A cutout similar to that described above may be formed at the base of the pair of pins 11 of this structure, and the solder may be broken at the cutout after soldering.

3) After the leg portions 8a of the pair of terminal members 8 are press-fitted into the connecting portions 2d of the bobbin member 2, the yoke 3, the permanent magnet 4, and the pole 5 are assembled to the bobbin member 2, and the bobbin member The coil conductor 6 may be wound around 2. 4) A bolt hole is formed in the mounting flange portion 9b of the case 9, the mounting flange portion 9b is brought into contact with the case of the automatic transmission, and the bolt inserted through the bolt hole is fixed to the case of the automatic transmission. The structure may be as follows.

Next, a rotation speed sensor according to another embodiment and a method of manufacturing the same will be described. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 7, the connecting portion 2d of the bobbin member 2 is omitted, and the mounting surface 2c of the bobbin member 2 is extended upward,
On this mounting surface 2c, two pairs of pin portions 11 as a temporary fixing portion 10 similar to the above and a pair of positioning pins 12 are integrally formed. In order to fix the legs 8a of the pair of terminal members 8 by heat fusion, a pair of small upper and lower small protrusions 17 corresponding to each leg 8a are integrally formed on the upper portion of the mounting surface 2c. Each leg 8a is formed with a small-diameter hole into which a pair of small projections 17 fits.

Each leg 8a is brought into contact with the mounting surface 2c,
By heating and melting the small projections 17 in a state where the pair of small projections 17 are fitted in the small diameter holes of the corresponding legs 8a, each leg 8a is fixed to the mounting surface 2c by heat fusion. .
Thereafter, the end of the coil wire 6 wound around the bobbin member 2 is entangled with the base of the corresponding pair of pins 11 in the same manner as described above and temporarily fixed, and then soldered in the same manner as described above. In addition, 1
After fixing the pair of terminal members 8 by heat fusion as described above, the yoke 3, the permanent magnet 4, the pole 5, and the coil conductor 6 may be assembled to the bobbin member 2. Then, after performing the soldering as described above, the case 9 containing the bobbin member 2 and the terminal member 8 in the same manner as the above-described embodiment.
Is formed by full molding.

According to the rotational speed sensor and the method of manufacturing the same, the terminal member 8 is formed into an L-shape including the leg 8a and the terminal 8b, and the terminal member 8 is formed with the mounting surface 2c. Of the terminal member 8 through the small projection 17 formed in the terminal member 8 and the small diameter hole of the leg 8a.
Since a can be fixed to the mounting surface 2c by heat fusion, the structure of the terminal member 8 is simplified, and the assembling of the terminal member 8 is simplified. Since it is not necessary to insert-mold the terminal member at the time of molding the bobbin member 2, the structure of the mold for molding the bobbin member is simplified and the molding cost is reduced. Other operations and effects similar to those of the above embodiment can be obtained.

[0032]

According to the first aspect of the present invention, the terminal member is formed in an L-shape including a leg portion and a terminal portion, a connecting portion is formed on the bobbin member, and the leg portion of the terminal member is pressed into the connecting portion. As a result, the structure of the terminal member is simplified, and the assembling of the terminal member is simplified.
Since it is not necessary to insert-mold the terminal member at the time of molding the bobbin member, the structure of the mold for molding the bobbin member is simplified, and the molding cost is reduced. Since the bobbin member is provided with a temporary fixing portion for temporarily fixing the end of the coil conductor, the end of the coil conductor can be temporarily fixed to the temporary fixing portion and then soldered to the leg.

According to the second aspect of the present invention, the terminal member is formed in an L-shape including a leg portion and a terminal portion, a mounting surface is formed on the terminal member, and the leg portion of the terminal member is heat-sealed to the mounting surface. , The structure of the terminal member is simplified, and the assembly of the terminal member is simplified. Since it is not necessary to insert-mold the terminal member at the time of molding the bobbin member, the structure of the mold for molding the bobbin member is simplified, and the molding cost is reduced. Since the bobbin member is provided with a temporary fixing portion for temporarily fixing the end of the coil conductor, the end of the coil conductor can be temporarily fixed to the temporary fixing portion and then soldered to the leg.

According to the third aspect of the present invention, the temporary fixing portion is constituted by a pair of pin portions projecting from both sides of the leg, so that the temporary fixing portion has a simple structure. The end of the coil conductor can be wound around the temporary fixing portion so that it can be soldered to the leg of the terminal member. The other effects are the same as those of the first aspect.

According to the fourth aspect of the present invention, the notch for restricting the axial movement of the pin portion of the coil conductor is formed at the base of each pin. The movement of the coil conductor is regulated by the notch by winding the end of the coil conductor, and soldering can be performed in that state. The other effects are the same as those of the third aspect.

According to the fifth aspect of the present invention, the pair of pin portions are formed such that the distance between the pin portions becomes smaller as they approach the base portion side. Can be wound, held in that state, and soldered in that state. The other effects are the same as those of the third aspect.

According to the sixth aspect of the present invention, when manufacturing the rotational speed sensor, the leg portion of the terminal member is press-fitted into the connection portion of the bobbin member, and the coil conductor wound around a part of the outer peripheral portion of the bobbin member. The end is entangled with the temporary fixing portion of the bobbin member and temporarily fixed, the temporarily fixed coil conductor is soldered to the leg portion of the terminal member, and the case is fully filled with the bobbin member and the pair of terminal members. Since molding is performed, assembling of the terminal member is simplified, and since there is no need to insert-mold the terminal member when forming the bobbin member, the cost of forming the bobbin member can be reduced, and the manufacturing cost of the rotation speed sensor can be reduced.

According to the seventh aspect of the present invention, when the rotational speed sensor is manufactured, the leg of the terminal member is fixed to the mounting surface of the bobbin member by heat welding, and wound around a part of the outer peripheral portion of the bobbin member. The end of the attached coil conductor is entangled with the temporary fixing portion of the bobbin member and temporarily fixed, the temporarily fixed coil conductor is soldered to the leg of the terminal member, and the bobbin member and the pair of terminal members are included. Since the case is fully molded in the state, as in claim 6, assembling of the terminal member is simplified, and there is no need to insert-mold the terminal member at the time of bobbin member molding, so that the bobbin member molding cost can be reduced, and the rotational speed can be reduced. The manufacturing cost of the sensor can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a rotation speed sensor according to an embodiment of the present invention.

FIG. 2 is a front view, partially cut away, of a vertical section of the rotational speed sensor.

FIG. 3 is a longitudinal sectional side view of a bobbin member and the like of the rotation speed sensor.

FIG. 4 is a front view of a bobbin member and the like of the rotation speed sensor.

FIG. 5 is an enlarged perspective view of a main part of the rotation speed sensor.

FIG. 6 is an enlarged perspective view of a main part of a rotation speed sensor according to a modification.

FIG. 7 is a perspective view of a bobbin member and the like according to a modified embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation speed sensor 2 Bobbin member 4 Permanent magnet 6 Coil conductor 6a End of coil conductor 8 Terminal member 8a Leg 8b Terminal 9 Case 10 Temporary fixing part 11 Pin part 11a Notch part 12 Positioning pin 14 Solder 17 Small projection part

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Koichi Satake 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Hideki Zaima 4-9-1-15 Oshu, Minami-ku, Hiroshima City, Hiroshima Prefecture Inside Y.N.S. Co., Ltd. (72) Inventor Murere Kazumi 4-9-1-15 Oshu, Minami-ku, Hiroshima-shi, Hiroshima Prefecture Within Y.N.Y. −15 Inside YNS Co., Ltd.

Claims (7)

[Claims] 1. A synthetic resin bobbin member having a coil conductor wound around a part of an outer peripheral portion thereof and containing at least a magnet therein, a pair of terminal members, and a synthetic resin including the bobbin member and the terminal member. And a terminal that is fixed to the bobbin member in the axial direction of the bobbin member, and extends at a right angle from one end of the leg portion and is connected to an external harness. The bobbin member includes a connecting portion capable of press-fitting and fixing each leg of the pair of terminal members from a direction parallel to the axial direction thereof, and an end of the coil conductor. A rotational speed sensor comprising: a temporary fixing portion for temporarily fixing the portion to each of the press-fitted legs so as to be solderable. 2. A bobbin member made of a synthetic resin in which a coil conductor is wound around a part of an outer peripheral portion and at least a magnet is housed inside, a pair of metal terminal members, and a bobbin member and a terminal member are included. Wherein each terminal member is oriented in the axial direction of the bobbin member and is fixed to the bobbin member, and an external harness extending at a right angle from one end of the leg portion. The bobbin member has a mounting surface parallel to the axial direction thereof,
A small projection for fixing each leg to the mounting surface by heat fusion, and a temporary fixing portion for temporarily fixing an end of the coil conductor to each leg in a solderable state. Characterized rotation speed sensor. 3. The rotation speed sensor according to claim 1, wherein the temporary fixing portion includes a pair of pins protruding from both sides of the leg. 4. The rotational speed sensor according to claim 3, wherein a cutout portion is formed at a base of each of the pin portions to restrict axial movement of the pin portion of the coil conductor. 5. The rotation speed sensor according to claim 3, wherein the pair of pin portions are formed such that the distance between the pin portions becomes smaller as approaching the base portion side. 6. A method of manufacturing a rotational speed sensor after previously manufacturing a synthetic resin bobbin member for winding a coil conductor around a part of an outer peripheral portion and a pair of metal terminal members. In the first step, a leg portion of each terminal member is press-fitted to a connection portion of the bobbin member, and an end portion of a coil wire wound around a part of an outer peripheral portion of the bobbin member is temporarily fixed to the bobbin member. A second step of temporarily fixing the coil conductor to the legs of the terminal member; and a case including the bobbin member and the pair of terminal members. And a fourth step of performing full molding of the rotational speed sensor. 7. A method of manufacturing a rotational speed sensor after previously manufacturing a synthetic resin bobbin member for winding a coil conductor around a part of an outer peripheral portion and a pair of metal terminal members. In the first step, a leg portion of each terminal member is connected to a mounting surface of a side portion of the bobbin member by heat fusion, and an end portion of a coil wire wound around a part of an outer peripheral portion of the bobbin member. A second step of entanglement with the temporary fixing portion of the bobbin member and a third step of soldering the temporarily fixed coil conductor to a leg of the terminal member; and the bobbin member and a pair of terminal members. A fourth step of full-molding the case so as to enclose the case, and a method of manufacturing a rotation speed sensor.